Beaucoup Group

Occurrence in Alaska, United States with commodities Copper, Silver, Tin

Geologic information

Identification information

Deposit ID 10001730
MRDS ID A012514
Record type Site
Current site name Beaucoup Group
Alternate or previous names Beaucoup Creek

Geographic coordinates

Geographic coordinates: -147.74337, 68.21977 (WGS84)
Relative position Site is at an elevation of about 5,000 ft. on a ridge approximately 1 1/2 mile west of upper Beaucoup Creek and 6 miles north-northeast of the mouth of Beaucoup Creek (SE1/4 sec. 16, T. 14 S., R. 19 E., of the Umiat Meridian). Location accurate within 1-mile radius
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Silver Secondary
Tin Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore
Calcite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Beaucoup Formation
    Rock description Beaucoup Formation
    Stratigraphic age (youngest) Late Devonian
    Stratigraphic age (youngest) Late Devonian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Rock unit name Beaucoup Formation;Beaucoup Formation
    Rock description Beaucoup Formation;Beaucoup Formation

Nearby scientific data

(1) -147.74337, 68.21977

Comments on the geologic information

  • Geologic Description = Visible chalcopyrite and malachite in the remnants of a leached quartz vein in limestone within the Beaucoup Formation (Barker, 1978). Geochemical analysis of a sample of a mineralized quartz-calcite vein crosscutting siltstone and shale of Beaucoup Formation shows anomalous Ag (7 ppm) and Sn (10 ppm) (Cathrall and others, 1977b, sample 75 RR 120). No other descriptive information is available.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Chandalar

Comments on the workings information

  • Workings / Exploration = Eight claims located in 1971 by Placid Oil, and exploration was said to be continuing in 1978 (Barker, 1978; Menzie and others, 1985).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012514
USGS Alaska Resource Data File ARDF PS004

Bibliographic references

  • Deposit

    Cathrall, J.B., Cooley, E.F., Detra, D.E., and O'Leary, R.M., 1977, A listing and statistical summary of spectrographic and chemical analysis of stream-sediment and rock samples from the Philip Smith Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-244, 79 p.

  • Deposit

    Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Barker, J.C., 1978, Mineral Investigations of certain lands in the eastern Brooks Range: a summary report: US Bureau of Mines Open-File No. 63-78

  • Deposit

    Brosgi, W.P., Reiser, H. N., Dutro, J. T., Jr., and Detterman, R. L., 1979, Bedrock geologic map of the Philip Smith Mountains quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-879-B, 2 sheets, scale 1:250,000.

  • Deposit

    Menzie, W.D., Reiser, H.N., Brosgi, W.P., and Detterman, R.L., 1985, Map showing distribution of mineral resources (excepting oil and gas) in the Philip Smith Mountains quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Investigations Map MF-879-C, 2 sheets, scale 1:250,000.

  • Deposit

    Maas, K.M., 1987, Availability of land for Mineral exploration and development in northern Alaska, 1986: U.S. Bureau of Mines Special Publication, 34 p., 33 sheets.

Comments on the references

  • Primary Reference = Menzie and others, 1985

Reporter information

Type Date Name Affiliation Comment
Reporter 17-NOV-1999 J.M. Britton U.S. Geological Survey